[doc] Reformat the doc & added travis ci badge
[doc] Reformat the doc & added travis ci badge

mrlannigan/memcached,kbarbounakis/memcached,Starefossen/memcached,fouber/node-memcached,andrewbrereton/memcached,mbrukman/node-memcache-client,3rd-Eden/memcached,fouber/node-memcached,acarrasco/node-memcached,jolks/node-memcached,Starefossen/memcached,jolks/node-memcached,jkrems/memcached,mgetz/memcached,XadillaX/node-memcached,mgetz/memcached,mbrukman/node-memcache-client,3rd-Eden/node-memcached,andrewbrereton/memcached,acarrasco/node-memcached,jkrems/memcached,mrlannigan/memcached,XadillaX/node-memcached,3rd-Eden/node-memcached,3rd-Eden/memcached,kbarbounakis/memcached